Tool attachment



(No Model.)

J. H. DIXON.

TOOL ATTACHMENT.

No.421,391. Patented Feb. 18, 1890.

m g, 5 i a m ---x l J c m WITNESSES. INVENTOR.

$Wfiw M/MQUKW.

N. PETERS. Pha(u-Lilhr.mphur, Walhi UNITED STATES PATENT OFFICE.

JOHN H. DIXON, OF PITTSBURG, PENNSYLVANIA.

TOOL ATTACH M ENT.-

SPECIFICATION forming part of Letters Patent No. 421,391, dated February18, 1890.

Application filed March 21, 1888- Serial No. 267,982. (No model.)

To all whom it may concern:

Be it known that 1, JOHN H. DIXON, of Pittsburg, in the county ofAllegheny and State of Pennsylvania, have invented a new and usefulImprovement in Tool Attachments; and I do hereby declare the followingto be a full, clear, and exact description thereof, reference being hadto the accompanying drawings, forming part of this specification, inwhich- Figure 1 is a side view of my improvement in tools. Figs. 2 and 3are sections on the line as a: of Fig. 1.

Like letters of reference indicate like parts in each.

In the drawings, a represents a rectangular frame formed of brass .orother suitable material. Extending transversely through this frame atthe middle thereof is a shaft 1) c, which is journaled in bearings orsockets cl, forming part of the frame. This shaft 19 c is formed in twoparts, being divided at the point 6 about midway inside of the frame,the portion 1) of the shaft being countersunk, while the end a isprovided with a proj ection which fits in the countersunk portion, so asto form a mutual bearing between the two portions of the shaft. Keyed tothe portion 17 of the shaft within the frame a is a gear-wheel f, andkeyed to the portion 0 of the shaft within the frame is a pinion g. Oneach side of the shaft b 0, within the frame a, are shaft-s h 1', onwhich are keyed the pin ionsj 7c and gear-wheels Z in, the pinions 7cgearing with the gear-wheel f and the gearwheels Z on gearing with thepinion g. The two ends of the shaft b c which extend beyond the frame aare squared, so as to receive and engage with a socket-piece n, which isprovided with a socket at each end, one socket being to engage with theshaft and the opposite socket being for the purpose of receiving a bit.As each end of the shaft 1) 0 projects beyond the frame a and is squaredto receive the socket-piece a, it also fits the mouth of the brace p,the mouth of which is provided with the usual set-screw for securing theshaft 1) c to the brace.

The operationis as follows: The brace being fitted on the projectingportion 1) of the shaft and secured thereto by the set-screw, thesocket-piece n is fitted on the projecting portion a of the shaft, andthe bit is fitted in the other end of the socket-piece. Upon turn ingthe brace power is applied to the portion Z) of the shaft and by meansof the gear-wheel f to the pinions 7 7c and shafts h 11, whereby thegear-wheels Z m impart power to the pinion 9 and portion 0 of thepower-shaft, whereby the bit is given a rapid revolution compared to therevolution of the brace. By rcversing the socket-piece n to theportion 1) of the power-shaft and the brace to the portion 0 of thepower-shaft the pinion g imparts power to the gear-wheels Z in, andshafts h 2', and the pinions j impart power to the gearwheel f on thepart b of the shaft, so that a slow but powerful movement is imparted tothe bit by the movement of the brace.

The advantages of my improvement are, that by merely reversing the partsa powerful and slow movement may be imparted to the bit, or, where it isdesired, a rapid motion may be applied to the same. Another advantage isthat the vertical force applied to the bit is in a'straight line on theshaft 1) c.

This attachment may be applied to boring and drilling tools and machinesof any kind, whether they be used for working on wood or metal, andinstead of using it with a brace, such as I have shown, any othersuitable powerconnection may be employed.

. I claim-- 1. A frame a, a power-shaft composed of the jointed andseparable parts I) c, the said parts I; and c projecting through theframe 011 opposite sides and in alignment, and squared to receive powerand tool appliances, a gear-wheel and a pinion on said shaft, two shaftsh and 1;, arranged in bearings in said frame and on opposite sides ofthe powershaft, and pinions and gear-wheels on said shafts h and 1',respectively engaging with the gear-wheel and pinion on the power-shaft,the whole constituting a reversible differential motor attachment fortools, substantially as described.

2. The combination of a frame a, powershaft Z) 0, having gear-Wheel fand pinion g, In testimony whereof I have hereunto set the ends of theshaft being adapted to engage my hand this 13th day of Mtreh',.A. D.1888. 10 with a bit and brace-holder, gear-Wheelsj 71;; pinions Z m,shafts h 2', 2L socket-piece n, hav- JOHN H. DIXON. 5 ing' sockets atopposite ends to receive a bit and to be applied to the power-shaft, anda Vitnesses: brace and bit, substantially as and for the KB. CORWIN,purposes described. JNO. K. SMITH.

